<md-button ng-class="{'active' : isSelected()}" ui-sref="{{(section.type === 'version' ? '' : '') + section.state}}" ng-click="focusSection()">
  <md-icon md-svg-src="{{section.icon}}"></md-icon>
  {{section | humanizeDoc}}
  <span class="md-visually-hidden" ng-if="isSelected()">  current page </span>
</md-button>
